The mainstream media initially gave little or no coverage to presidential candidate Barack Obama's failure to produce a birth certificate, then lambasted those who questioned his eligibility for the White House.

But the press is already bringing up the question of Cruz's eligibility for president — which suggests that Democratic sympathizers are worried about his possible run for the White House in 2016.

Obama was born in Hawaii to an American mother and a Kenyan father, although some questioned his Hawaiian birth. Cruz was born in Canada to an American mother and a Cuban father who were working in the petroleum industry, and he lived in Canada for four years before his family moved to Texas.